Braking/driving force control system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTomonori NONAMI, Shin NOMURA, Takeshi INOGUCHI, Yoshihide NAKANE
Life of this patent
Estimating the term…
Abstract
A braking/driving force control system, during control for maintaining a target vehicle speed, performs fuel cut and then, when a required braking/driving force for maintaining the target vehicle speed reduces, makes a downshift while fuel cut is continued. The braking/driving force control system causes a brake to generate a braking force such that the sum of a braking/driving force that a powertrain generates and the braking force that the brake generates agrees with the required braking/driving force. Thus, good fuel efficiency and riding comfort are obtained.
Claims3
A control device that controls a powertrain including an engine and a stepped transmission, the control device comprising:
- a fuel cut braking/driving force calculating unit configured to, in a current gear stage of the stepped transmission and the gear stage downshifted from the current gear stage, calculate a first fuel cut braking/driving force and a second fuel cut braking/driving force that are braking/driving forces that the powertrain generates while fuel cut of the engine is being performed;
- and
- a shift control unit configured to, based on a relationship of a required braking/driving force, the first fuel cut braking/driving force, and the second fuel cut braking/driving force perform, a setting of the gear stage of the stepped transmission, and fuel cut of the engine in the set gear stage.
A method that is performed by a control device that controls a powertrain including an engine and a stepped transmission, the method comprising:
- calculating, in a current gear stage of the stepped transmission and a gear stage downshifted from the current gear stage, a first fuel cut braking/driving force and a second fuel cut braking/driving force that are braking/driving forces that the powertrain generates while fuel cut of the engine is being performed, and
- performing a setting of the gear stage of the stepped transmission, and fuel cut of the engine in the set gear stage, based on a relationship of a required braking/driving force, the first fuel cut braking/driving force, and the second fuel cut braking/driving force.
A non-transitory storage medium storing instructions that are executable by one or more processors and that cause the one or more processors to perform functions comprising:
- calculating, in a current gear stage of a stepped transmission and a gear stage downshifted from the current gear stage, a first fuel cut braking/driving force and a second fuel cut braking/driving force that are braking/driving forces that a powertrain generates while fuel cut of a engine is being performed, and
- performing a setting of the gear stage of the stepped transmission, and fuel cut of the engine in the set gear stage, based on a relationship of a required braking/driving force, the first fuel cut braking/driving force, and the second fuel cut braking/driving force.
Dependencies are inferred from the claim text.